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EMPLOYEE BENEFIT PLANS - Fair Value of Pension Plan Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	$ 41,764	$ 87,255	$ 86,103
Fair value
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	41,764	87,255
Fair value | Short-term investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	555	2,444
Fair value | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	41,150	84,790
Fair value | Domestic stock funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	7,318	35,212
Fair value | Bond funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	29,093	17,679
Fair value | Balanced funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		17,520
Fair value | International stock funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	4,739	14,379
Fair value | Oil and gas properties
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	59	21
Fair value | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	41,705	87,234
Fair value | Level 1 | Short-term investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	555	2,444
Fair value | Level 1 | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	41,150	84,790
Fair value | Level 1 | Domestic stock funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	7,318	35,212
Fair value | Level 1 | Bond funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	29,093	17,679
Fair value | Level 1 | Balanced funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		17,520
Fair value | Level 1 | International stock funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	4,739	14,379
Fair value | Level 1 | Oil and gas properties
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Fair value | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Fair value | Level 2 | Short-term investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Fair value | Level 2 | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Fair value | Level 2 | Domestic stock funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Fair value | Level 2 | Bond funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Fair value | Level 2 | Balanced funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		0
Fair value | Level 2 | International stock funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Fair value | Level 2 | Oil and gas properties
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Fair value | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	59	21
Fair value | Level 3 | Short-term investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Fair value | Level 3 | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Fair value | Level 3 | Domestic stock funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Fair value | Level 3 | Bond funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Fair value | Level 3 | Balanced funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		0
Fair value | Level 3 | International stock funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Fair value | Level 3 | Oil and gas properties
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	$ 59	$ 21

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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